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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.configuration.interpol;
<a class="jxr_linenumber" name="18" href="#18">18</a>  
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="20" href="#20">20</a>  
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.AbstractConfiguration;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.ConfigurationRuntimeException;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.jexl2.Expression;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.jexl2.JexlContext;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.jexl2.JexlEngine;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.jexl2.MapContext;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.lang.ClassUtils;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.lang.StringUtils;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.lang.text.StrLookup;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.lang.text.StrSubstitutor;
<a class="jxr_linenumber" name="31" href="#31">31</a>  
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * Lookup that allows expressions to be evaluated.</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="36" href="#36">36</a>  <em class="jxr_javadoccomment"> *     ExprLookup.Variables vars = new ExprLookup.Variables();</em>
<a class="jxr_linenumber" name="37" href="#37">37</a>  <em class="jxr_javadoccomment"> *     vars.add(new ExprLookup.Variable("String", org.apache.commons.lang.StringUtils.class));</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment"> *     vars.add(new ExprLookup.Variable("Util", new Utility("Hello")));</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> *     vars.add(new ExprLookup.Variable("System", "Class:java.lang.System"));</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> *     XMLConfiguration config = new XMLConfiguration(TEST_FILE);</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> *     config.setLogger(log);</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> *     ExprLookup lookup = new ExprLookup(vars);</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> *     lookup.setConfiguration(config);</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> *     String str = lookup.lookup("'$[element] ' + String.trimToEmpty('$[space.description]')");</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * In the example above TEST_FILE contains xml that looks like:</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * &amp;lt;configuration&amp;gt;</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> *   &amp;lt;element&amp;gt;value&amp;lt;/element&amp;gt;</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> *   &amp;lt;space xml:space="preserve"&amp;gt;</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> *     &amp;lt;description xml:space="default"&amp;gt;     Some text      &amp;lt;/description&amp;gt;</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> *   &amp;lt;/space&amp;gt;</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &amp;lt;/configuration&amp;gt;</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * The result will be "value Some text".</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * This lookup uses Apache Commons Jexl and requires that the dependency be added to any</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> * projects which use this.</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> * @since 1.7</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> * @author &lt;a</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * href="<a href="http://commons.apache.org/configuration/team-list.html" target="alexandria_uri">http://commons.apache.org/configuration/team-list.html</a>"&gt;Commons Configuration team&lt;/a&gt;</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> * @version $Id: ExprLookup.java 1234539 2012-01-22 16:19:15Z oheger $</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">ExprLookup</a> <strong class="jxr_keyword">extends</strong> StrLookup
<a class="jxr_linenumber" name="68" href="#68">68</a>  {
<a class="jxr_linenumber" name="69" href="#69">69</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Prefix to identify a Java Class object */</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String CLASS = <span class="jxr_string">"Class:"</span>;
<a class="jxr_linenumber" name="71" href="#71">71</a>  
<a class="jxr_linenumber" name="72" href="#72">72</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The default prefix for subordinate lookup expressions */</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_PREFIX = <span class="jxr_string">"$["</span>;
<a class="jxr_linenumber" name="74" href="#74">74</a>  
<a class="jxr_linenumber" name="75" href="#75">75</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The default suffix for subordinate lookup expressions */</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String DEFAULT_SUFFIX = <span class="jxr_string">"]"</span>;
<a class="jxr_linenumber" name="77" href="#77">77</a>  
<a class="jxr_linenumber" name="78" href="#78">78</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> <a href="../../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> being operated on */</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> configuration;
<a class="jxr_linenumber" name="80" href="#80">80</a>  
<a class="jxr_linenumber" name="81" href="#81">81</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The engine. */</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> JexlEngine engine = <strong class="jxr_keyword">new</strong> JexlEngine();
<a class="jxr_linenumber" name="83" href="#83">83</a>  
<a class="jxr_linenumber" name="84" href="#84">84</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The variables maintained by this object. */</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> variables;
<a class="jxr_linenumber" name="86" href="#86">86</a>  
<a class="jxr_linenumber" name="87" href="#87">87</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The String to use to start subordinate lookup expressions */</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>      <strong class="jxr_keyword">private</strong> String prefixMatcher = DEFAULT_PREFIX;
<a class="jxr_linenumber" name="89" href="#89">89</a>  
<a class="jxr_linenumber" name="90" href="#90">90</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The String to use to terminate subordinate lookup expressions */</em>
<a class="jxr_linenumber" name="91" href="#91">91</a>      <strong class="jxr_keyword">private</strong> String suffixMatcher = DEFAULT_SUFFIX;
<a class="jxr_linenumber" name="92" href="#92">92</a>  
<a class="jxr_linenumber" name="93" href="#93">93</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>  <em class="jxr_javadoccomment">     * The default constructor. Will get used when the Lookup is constructed via</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>  <em class="jxr_javadoccomment">     * configuration.</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">ExprLookup</a>()
<a class="jxr_linenumber" name="98" href="#98">98</a>      {
<a class="jxr_linenumber" name="99" href="#99">99</a>      }
<a class="jxr_linenumber" name="100" href="#100">100</a> 
<a class="jxr_linenumber" name="101" href="#101">101</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment">     * Constructor for use by applications.</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment">     * @param list The list of objects to be accessible in expressions.</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="105" href="#105">105</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">ExprLookup</a>(<a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> list)
<a class="jxr_linenumber" name="106" href="#106">106</a>     {
<a class="jxr_linenumber" name="107" href="#107">107</a>         setVariables(list);
<a class="jxr_linenumber" name="108" href="#108">108</a>     }
<a class="jxr_linenumber" name="109" href="#109">109</a> 
<a class="jxr_linenumber" name="110" href="#110">110</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment">     * Constructor for use by applications.</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment">     * @param list The list of objects to be accessible in expressions.</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">     * @param prefix The prefix to use for subordinate lookups.</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment">     * @param suffix The suffix to use for subordinate lookups.</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="116" href="#116">116</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">ExprLookup</a>(<a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> list, String prefix, String suffix)
<a class="jxr_linenumber" name="117" href="#117">117</a>     {
<a class="jxr_linenumber" name="118" href="#118">118</a>         <strong class="jxr_keyword">this</strong>(list);
<a class="jxr_linenumber" name="119" href="#119">119</a>         setVariablePrefixMatcher(prefix);
<a class="jxr_linenumber" name="120" href="#120">120</a>         setVariableSuffixMatcher(suffix);
<a class="jxr_linenumber" name="121" href="#121">121</a>     }
<a class="jxr_linenumber" name="122" href="#122">122</a> 
<a class="jxr_linenumber" name="123" href="#123">123</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment">     * Set the prefix to use to identify subordinate expressions. This cannot be the</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment">     * same as the prefix used for the primary expression.</em>
<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment">     * @param prefix The String identifying the beginning of the expression.</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="128" href="#128">128</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setVariablePrefixMatcher(String prefix)
<a class="jxr_linenumber" name="129" href="#129">129</a>     {
<a class="jxr_linenumber" name="130" href="#130">130</a>         prefixMatcher = prefix;
<a class="jxr_linenumber" name="131" href="#131">131</a>     }
<a class="jxr_linenumber" name="132" href="#132">132</a> 
<a class="jxr_linenumber" name="133" href="#133">133</a> 
<a class="jxr_linenumber" name="134" href="#134">134</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment">     * Set the suffix to use to identify subordinate expressions. This cannot be the</em>
<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment">     * same as the suffix used for the primary expression.</em>
<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * @param suffix The String identifying the end of the expression.</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="139" href="#139">139</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setVariableSuffixMatcher(String suffix)
<a class="jxr_linenumber" name="140" href="#140">140</a>     {
<a class="jxr_linenumber" name="141" href="#141">141</a>         suffixMatcher = suffix;
<a class="jxr_linenumber" name="142" href="#142">142</a>     }
<a class="jxr_linenumber" name="143" href="#143">143</a> 
<a class="jxr_linenumber" name="144" href="#144">144</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment">     * Add the Variables that will be accessible within expressions.</em>
<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment">     * @param list The list of Variables.</em>
<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="148" href="#148">148</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setVariables(<a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> list)
<a class="jxr_linenumber" name="149" href="#149">149</a>     {
<a class="jxr_linenumber" name="150" href="#150">150</a>         variables = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a>(list);
<a class="jxr_linenumber" name="151" href="#151">151</a>     }
<a class="jxr_linenumber" name="152" href="#152">152</a> 
<a class="jxr_linenumber" name="153" href="#153">153</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment">     * Returns the list of Variables that are accessible within expressions.</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment">     * @return the List of Variables that are accessible within expressions.</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="157" href="#157">157</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> getVariables()
<a class="jxr_linenumber" name="158" href="#158">158</a>     {
<a class="jxr_linenumber" name="159" href="#159">159</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="160" href="#160">160</a>     }
<a class="jxr_linenumber" name="161" href="#161">161</a> 
<a class="jxr_linenumber" name="162" href="#162">162</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="163" href="#163">163</a> <em class="jxr_javadoccomment">     * Set the configuration to be used to interpolate subordinate expressions.</em>
<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment">     * @param config The Configuration.</em>
<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="166" href="#166">166</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setConfiguration(<a href="../../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> config)
<a class="jxr_linenumber" name="167" href="#167">167</a>     {
<a class="jxr_linenumber" name="168" href="#168">168</a>         <strong class="jxr_keyword">this</strong>.configuration = config;
<a class="jxr_linenumber" name="169" href="#169">169</a>     }
<a class="jxr_linenumber" name="170" href="#170">170</a> 
<a class="jxr_linenumber" name="171" href="#171">171</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="172" href="#172">172</a> <em class="jxr_javadoccomment">     * Evaluates the expression.</em>
<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_javadoccomment">     * @param var The expression.</em>
<a class="jxr_linenumber" name="174" href="#174">174</a> <em class="jxr_javadoccomment">     * @return The String result of the expression.</em>
<a class="jxr_linenumber" name="175" href="#175">175</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="176" href="#176">176</a>     @Override
<a class="jxr_linenumber" name="177" href="#177">177</a>     <strong class="jxr_keyword">public</strong> String lookup(String <strong class="jxr_keyword">var</strong>)
<a class="jxr_linenumber" name="178" href="#178">178</a>     {
<a class="jxr_linenumber" name="179" href="#179">179</a>         <a href="../../../../../org/apache/commons/configuration/interpol/ConfigurationInterpolator.html">ConfigurationInterpolator</a> interp = configuration.getInterpolator();
<a class="jxr_linenumber" name="180" href="#180">180</a>         StrSubstitutor subst = <strong class="jxr_keyword">new</strong> StrSubstitutor(interp, prefixMatcher, suffixMatcher,
<a class="jxr_linenumber" name="181" href="#181">181</a>                 StrSubstitutor.DEFAULT_ESCAPE);
<a class="jxr_linenumber" name="182" href="#182">182</a> 
<a class="jxr_linenumber" name="183" href="#183">183</a>         String result = subst.replace(<strong class="jxr_keyword">var</strong>);
<a class="jxr_linenumber" name="184" href="#184">184</a> 
<a class="jxr_linenumber" name="185" href="#185">185</a>         <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="186" href="#186">186</a>         {
<a class="jxr_linenumber" name="187" href="#187">187</a>             Expression exp = engine.createExpression(result);
<a class="jxr_linenumber" name="188" href="#188">188</a>             result = (String) exp.evaluate(createContext());
<a class="jxr_linenumber" name="189" href="#189">189</a>         }
<a class="jxr_linenumber" name="190" href="#190">190</a>         <strong class="jxr_keyword">catch</strong> (Exception e)
<a class="jxr_linenumber" name="191" href="#191">191</a>         {
<a class="jxr_linenumber" name="192" href="#192">192</a>             configuration.getLogger().debug(<span class="jxr_string">"Error encountered evaluating "</span> + result, e);
<a class="jxr_linenumber" name="193" href="#193">193</a>         }
<a class="jxr_linenumber" name="194" href="#194">194</a> 
<a class="jxr_linenumber" name="195" href="#195">195</a>         <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="196" href="#196">196</a>     }
<a class="jxr_linenumber" name="197" href="#197">197</a> 
<a class="jxr_linenumber" name="198" href="#198">198</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="199" href="#199">199</a> <em class="jxr_javadoccomment">     * Creates a new {@code JexlContext} and initializes it with the variables</em>
<a class="jxr_linenumber" name="200" href="#200">200</a> <em class="jxr_javadoccomment">     * managed by this Lookup object.</em>
<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="202" href="#202">202</a> <em class="jxr_javadoccomment">     * @return the newly created context</em>
<a class="jxr_linenumber" name="203" href="#203">203</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="204" href="#204">204</a>     <strong class="jxr_keyword">private</strong> JexlContext createContext()
<a class="jxr_linenumber" name="205" href="#205">205</a>     {
<a class="jxr_linenumber" name="206" href="#206">206</a>         JexlContext ctx = <strong class="jxr_keyword">new</strong> MapContext();
<a class="jxr_linenumber" name="207" href="#207">207</a>         initializeContext(ctx);
<a class="jxr_linenumber" name="208" href="#208">208</a>         <strong class="jxr_keyword">return</strong> ctx;
<a class="jxr_linenumber" name="209" href="#209">209</a>     }
<a class="jxr_linenumber" name="210" href="#210">210</a> 
<a class="jxr_linenumber" name="211" href="#211">211</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="212" href="#212">212</a> <em class="jxr_javadoccomment">     * Initializes the specified context with the variables managed by this</em>
<a class="jxr_linenumber" name="213" href="#213">213</a> <em class="jxr_javadoccomment">     * Lookup object.</em>
<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="215" href="#215">215</a> <em class="jxr_javadoccomment">     * @param ctx the context to be initialized</em>
<a class="jxr_linenumber" name="216" href="#216">216</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="217" href="#217">217</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> initializeContext(JexlContext ctx)
<a class="jxr_linenumber" name="218" href="#218">218</a>     {
<a class="jxr_linenumber" name="219" href="#219">219</a>         <strong class="jxr_keyword">for</strong> (Variable <strong class="jxr_keyword">var</strong> : variables)
<a class="jxr_linenumber" name="220" href="#220">220</a>         {
<a class="jxr_linenumber" name="221" href="#221">221</a>             ctx.set(<strong class="jxr_keyword">var</strong>.getName(), <strong class="jxr_keyword">var</strong>.getValue());
<a class="jxr_linenumber" name="222" href="#222">222</a>         }
<a class="jxr_linenumber" name="223" href="#223">223</a>     }
<a class="jxr_linenumber" name="224" href="#224">224</a> 
<a class="jxr_linenumber" name="225" href="#225">225</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_javadoccomment">     * List wrapper used to allow the Variables list to be created as beans in</em>
<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment">     * DefaultConfigurationBuilder.</em>
<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="229" href="#229">229</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> <strong class="jxr_keyword">extends</strong> ArrayList&lt;Variable&gt;
<a class="jxr_linenumber" name="230" href="#230">230</a>     {
<a class="jxr_linenumber" name="231" href="#231">231</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment">         * The serial version UID.</em>
<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="234" href="#234">234</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 20111205L;
<a class="jxr_linenumber" name="235" href="#235">235</a> 
<a class="jxr_linenumber" name="236" href="#236">236</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="237" href="#237">237</a> <em class="jxr_javadoccomment">         * Creates a new empty instance of {@code Variables}.</em>
<a class="jxr_linenumber" name="238" href="#238">238</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="239" href="#239">239</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a>()
<a class="jxr_linenumber" name="240" href="#240">240</a>         {
<a class="jxr_linenumber" name="241" href="#241">241</a>             <strong class="jxr_keyword">super</strong>();
<a class="jxr_linenumber" name="242" href="#242">242</a>         }
<a class="jxr_linenumber" name="243" href="#243">243</a> 
<a class="jxr_linenumber" name="244" href="#244">244</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code Variables} and copies the content of</em>
<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_javadoccomment">         * the given object.</em>
<a class="jxr_linenumber" name="247" href="#247">247</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="248" href="#248">248</a> <em class="jxr_javadoccomment">         * @param vars the {@code Variables} object to be copied</em>
<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="250" href="#250">250</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a>(<a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variables</a> vars)
<a class="jxr_linenumber" name="251" href="#251">251</a>         {
<a class="jxr_linenumber" name="252" href="#252">252</a>             <strong class="jxr_keyword">super</strong>(vars);
<a class="jxr_linenumber" name="253" href="#253">253</a>         }
<a class="jxr_linenumber" name="254" href="#254">254</a> 
<a class="jxr_linenumber" name="255" href="#255">255</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variable</a> getVariable()
<a class="jxr_linenumber" name="256" href="#256">256</a>         {
<a class="jxr_linenumber" name="257" href="#257">257</a>             <strong class="jxr_keyword">if</strong> (size() &gt; 0)
<a class="jxr_linenumber" name="258" href="#258">258</a>             {
<a class="jxr_linenumber" name="259" href="#259">259</a>                 <strong class="jxr_keyword">return</strong> get(size() - 1);
<a class="jxr_linenumber" name="260" href="#260">260</a>             }
<a class="jxr_linenumber" name="261" href="#261">261</a>             <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="262" href="#262">262</a>             {
<a class="jxr_linenumber" name="263" href="#263">263</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="264" href="#264">264</a>             }
<a class="jxr_linenumber" name="265" href="#265">265</a>         }
<a class="jxr_linenumber" name="266" href="#266">266</a> 
<a class="jxr_linenumber" name="267" href="#267">267</a>     }
<a class="jxr_linenumber" name="268" href="#268">268</a> 
<a class="jxr_linenumber" name="269" href="#269">269</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="270" href="#270">270</a> <em class="jxr_javadoccomment">     * The key and corresponding object that will be made available to the</em>
<a class="jxr_linenumber" name="271" href="#271">271</a> <em class="jxr_javadoccomment">     * JexlContext for use in expressions.</em>
<a class="jxr_linenumber" name="272" href="#272">272</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="273" href="#273">273</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variable</a>
<a class="jxr_linenumber" name="274" href="#274">274</a>     {
<a class="jxr_linenumber" name="275" href="#275">275</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The name to be used in expressions */</em>
<a class="jxr_linenumber" name="276" href="#276">276</a>         <strong class="jxr_keyword">private</strong> String key;
<a class="jxr_linenumber" name="277" href="#277">277</a> 
<a class="jxr_linenumber" name="278" href="#278">278</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The object to be accessed in expressions */</em>
<a class="jxr_linenumber" name="279" href="#279">279</a>         <strong class="jxr_keyword">private</strong> Object value;
<a class="jxr_linenumber" name="280" href="#280">280</a> 
<a class="jxr_linenumber" name="281" href="#281">281</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variable</a>()
<a class="jxr_linenumber" name="282" href="#282">282</a>         {
<a class="jxr_linenumber" name="283" href="#283">283</a>         }
<a class="jxr_linenumber" name="284" href="#284">284</a> 
<a class="jxr_linenumber" name="285" href="#285">285</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../../org/apache/commons/configuration/interpol/ExprLookup.html">Variable</a>(String name, Object value)
<a class="jxr_linenumber" name="286" href="#286">286</a>         {
<a class="jxr_linenumber" name="287" href="#287">287</a>             setName(name);
<a class="jxr_linenumber" name="288" href="#288">288</a>             setValue(value);
<a class="jxr_linenumber" name="289" href="#289">289</a>         }
<a class="jxr_linenumber" name="290" href="#290">290</a> 
<a class="jxr_linenumber" name="291" href="#291">291</a>         <strong class="jxr_keyword">public</strong> String getName()
<a class="jxr_linenumber" name="292" href="#292">292</a>         {
<a class="jxr_linenumber" name="293" href="#293">293</a>             <strong class="jxr_keyword">return</strong> key;
<a class="jxr_linenumber" name="294" href="#294">294</a>         }
<a class="jxr_linenumber" name="295" href="#295">295</a> 
<a class="jxr_linenumber" name="296" href="#296">296</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setName(String name)
<a class="jxr_linenumber" name="297" href="#297">297</a>         {
<a class="jxr_linenumber" name="298" href="#298">298</a>             <strong class="jxr_keyword">this</strong>.key = name;
<a class="jxr_linenumber" name="299" href="#299">299</a>         }
<a class="jxr_linenumber" name="300" href="#300">300</a> 
<a class="jxr_linenumber" name="301" href="#301">301</a>         <strong class="jxr_keyword">public</strong> Object getValue()
<a class="jxr_linenumber" name="302" href="#302">302</a>         {
<a class="jxr_linenumber" name="303" href="#303">303</a>             <strong class="jxr_keyword">return</strong> value;
<a class="jxr_linenumber" name="304" href="#304">304</a>         }
<a class="jxr_linenumber" name="305" href="#305">305</a> 
<a class="jxr_linenumber" name="306" href="#306">306</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setValue(Object value) <strong class="jxr_keyword">throws</strong> ConfigurationRuntimeException
<a class="jxr_linenumber" name="307" href="#307">307</a>         {
<a class="jxr_linenumber" name="308" href="#308">308</a>             <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="309" href="#309">309</a>             {
<a class="jxr_linenumber" name="310" href="#310">310</a>                 <strong class="jxr_keyword">if</strong> (!(value instanceof String))
<a class="jxr_linenumber" name="311" href="#311">311</a>                 {
<a class="jxr_linenumber" name="312" href="#312">312</a>                     <strong class="jxr_keyword">this</strong>.value = value;
<a class="jxr_linenumber" name="313" href="#313">313</a>                     <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="314" href="#314">314</a>                 }
<a class="jxr_linenumber" name="315" href="#315">315</a>                 String val = (String) value;
<a class="jxr_linenumber" name="316" href="#316">316</a>                 String name = StringUtils.removeStartIgnoreCase(val, CLASS);
<a class="jxr_linenumber" name="317" href="#317">317</a>                 Class&lt;?&gt; clazz = ClassUtils.getClass(name);
<a class="jxr_linenumber" name="318" href="#318">318</a>                 <strong class="jxr_keyword">if</strong> (name.length() == val.length())
<a class="jxr_linenumber" name="319" href="#319">319</a>                 {
<a class="jxr_linenumber" name="320" href="#320">320</a>                     <strong class="jxr_keyword">this</strong>.value = clazz.newInstance();
<a class="jxr_linenumber" name="321" href="#321">321</a>                 }
<a class="jxr_linenumber" name="322" href="#322">322</a>                 <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="323" href="#323">323</a>                 {
<a class="jxr_linenumber" name="324" href="#324">324</a>                     <strong class="jxr_keyword">this</strong>.value = clazz;
<a class="jxr_linenumber" name="325" href="#325">325</a>                 }
<a class="jxr_linenumber" name="326" href="#326">326</a>             }
<a class="jxr_linenumber" name="327" href="#327">327</a>             <strong class="jxr_keyword">catch</strong> (Exception e)
<a class="jxr_linenumber" name="328" href="#328">328</a>             {
<a class="jxr_linenumber" name="329" href="#329">329</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/commons/configuration/ConfigurationRuntimeException.html">ConfigurationRuntimeException</a>(<span class="jxr_string">"Unable to create "</span> + value, e);
<a class="jxr_linenumber" name="330" href="#330">330</a>             }
<a class="jxr_linenumber" name="331" href="#331">331</a> 
<a class="jxr_linenumber" name="332" href="#332">332</a>         }
<a class="jxr_linenumber" name="333" href="#333">333</a>     }
<a class="jxr_linenumber" name="334" href="#334">334</a> }
</pre>
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